Tozer, as he was affectionately known during his lifetime, is widely regarded as one of the most perceptive writers in the 20th century. He served as pastor of Christian & Missionary Alliance churches in Chicago and Toronto, and was a popular speaker and prolific author who wrote with biblical insight and prophetic precision. In 1950, he became the editor of the Alliance Witness. His best-known books, The Pursuit of God and The Knowledge of the Holy, are perennial best-sellers, and most of his writings are still in print.